“What he does is based on very advanced physiological science,” says Kosove. At Thomas’ new TRIO performance center in Brentwood (1161 San Vicente Blvd.), clients receive VO2 (oxygen consumption) and other tests to optimize training ($250 per session).

Former Moulin Rouge dancer Samantha Rabon has recruited a cadre of fellow dancers as instructors at the new XTEND BARRE (8254 Melrose Ave.). The workout ($250 a month) combines isometric movements, dance and cardio.

In February, celebrity trainer Tracy Anderson opens a Brentwood studio, where members can take virtual classes with Anderson herself. (11920 San Vicente Blvd., tracyandersonmethod.com, monthly fees from $500.)